Couldn't find any discussion concerning the new trinkets.
First the DPS Trinkets:
(1. Assurance of Consequence
Equip: Increases the cooldown recovery rate of six of your major abilities by 39%. Effective for Agility-based damage roles only.
Equip: Your attacks have a chance to grant you 11759 Agility for 20 sec. (ICD: 1 min)
Requires Level 90) Only works for DPS speccs.
2. Haromm's Talisman
+1959 Haste (4.61% @ L90)
Equip: Your attacks have a (196 / 10)% chance to trigger Multistrike, which deals instant additional damage to your target equal to 1/3 of the original damage dealt.
3. Sigil of Rampage
+1959 Critical Strike (3.27% @ L90)
Equip: Your attacks have a (434 / 100)% chance to Cleave, dealing the same damage to all other nearby targets.
Requires Level 90
4. Ticking Ebon Detonator
+1959 Mastery (3.27 @ L90)
Equip: Your melee and ranged attacks have a chance to grant you (1068 * 20) Agility for 20 sec. Every 5 this effect decrements by 1068 Agility. (Approximately 0.61 procs per minute, ICD: 22 sec)
5. 5.4 Raid - Normal - Siege of Orgrimmar - Boss X Loot X - Agi DPS Trinket (5)
+1959 Agility
Equip: When your attacks hit you have a chance to gain 11759 Mastery for 20 sec. (ICD: 1 min)
Tank Trinkets:
1. Rook's Unlucky Talisman
+2939 Stamina
Use: Reduces damage taken from creature area of effect attacks by 32% for 15 sec.
2. Juggernaut's Focusing Crystal
+1959 Dodge (2.21% @ L90)
Equip: Converts (266 / 100)% of all damage you deal into healing on yourself.
3. Vial of Living Corruption
+2939 Stamina
Equip: Increases the cooldown recovery rate of six of your major abilities by 18%. Effective for tank roles only.
Requires Level 90
4. Hellscream's Hubris
+2939 Stamina
Use: Increases your critical strike by 9793 for 15 sec. (1 Min, 30 Sec Cooldown)
5. 5.4 Raid - Normal - Siege of Orgrimmar - Boss X Loot X - Tank Trinket (5)
+1959 Mastery (3.27 @ L90)
Use: Increases dodge by 9793 for 20 sec. (2 Min Cooldown)
Some of the trinkets are really nice. I especially like the possibilietes of Rook's Unlucky Talisman which doesn't have a cooldown on PTR right now (intended?).
Juggernaut's Focusing Crystal is basically Deathwing's Souldrinker as a trinket. Though doesn't procc when you're at 100% and the highest procc I got was a 1.6K crit.
Vial of Living Corruption is nice. The best (and probably only useful) cooldown that gets reduced is Guard which brings it to a 25 Sec cooldown. This is amazing. But the flat Stamina increase could be better as another stat.
My personal choices would be:
1. Ticking Ebon Detonator which is basically Renataki backwards and the mastery can be reforged into crit or expertise.
2. Either 5.4 Raid - Normal - Siege of Orgrimmar - Boss X Loot X - Agi DPS Trinket (5) for low-tank dmg fights or Vial of Living Corruption for heavy damage fights.
What are your thoughts on the matter?